The author of Instructables, nicknamed saul, bought a vintage manual coffee grinder. Immediately after the acquisition, it looked like this:
The master parses it:
To clean metal parts, he uses two wire brushes: one miniature, for dremel, the second large - for the grinder. Be sure to take an example from the master: he uses PPE, and you?
The master processes the wooden parts manually with sandpaper:
And then apply two coats of Spar Varnish, using a self-developed fixture described here - "a piece of wall from Etsih with nails." Before applying the second layer, it allows to dry completely and harden the first.
Well, after drying and the second layer collects a coffee grinder:
And checks it in action:
Everything works, you can use it. Manual coffee grinder is a good example of the KISS principle. The fewer parts, the more reliable and maintainable. While in an electric coffee grinder the simultaneous jamming of the bearing and microswitch often leads to failure of the motor, the windings of which are not so easy to rewind.